DD145510A1 - ELECTRIC LOET PISTON - Google Patents

Abstract

The invention relates to an 'electrical' soldering iron with a heating body and a soldering tip, in particular for precision soldering in electronics. The invention has for its object to provide an electric soldering iron with low idle temperature, which also ensures a high heat output at the solder joint. According to the invention this is achieved in that the zvzischen radiator and soldering tip a heating body enclosing, and at soldering temperature liquid material with good thermal conductivity, in particular a eutectic zinc-aluminum alloy, is arranged and that the surface of the soldering iron roughened and / or blackened is. r- Figure '- <

Description

Electric soldering iron

Field of application of the invention

The invention relates to an electric soldering iron with a radiator and a soldering tip, in particular for Peinlötung in electronics.

Characteristic of the known technical solutions In the case of electrically heated soldering irons, the most varied regulations of the heating powers are known, eg. B. with resistance comparison in Meßbrückenschaltung according to DE-OS 2,157,701, with thermostat according to DE-OS 2,329,329 with thermomagnetic cup to DE-OS 2,209,409 or as a thermostat design taking advantage of the thermal expansion coefficient according to DE-OS 2 833200, in all these Arrangements and devices, however, always require a considerable amount of equipment.

According to DE-OS 2,430,865, it is also known to switch a series resistance in electrically heated soldering iron in the circuit, which can be bridged by push button during soldering. "The same effect is achieved with commercially available soldering iron by means of a diode. However, this requires special measures of the operator during handling.

DD-WP 96.620 also discloses a filled heating element which supplies the required heat by the solidification of a melt. However, this arrangement is generally limited to the toggle soldering and is for Serienlötung means

17 m 19 7.3- * 8 ϋίΠηΚ;

Hand soldering iron unsuitable, since after each soldering the WärmeζυίμΙΐΓ again triggered manually and the heating time must be waited · -. ·.

Object of the invention

The invention provides the soldering by hand soldering, in particular the soldering in the electronics, with low soldering time and with a low Temperaturabf all at Serienlötungen be made possible by simple means ·

Essence of the invention.

The invention is based on the object to provide an electric soldering iron with low idle temperature, which also ensures a high heat output at the solder joint ·

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According to the invention this is achieved in that between the radiator and the soldering iron a surrounding the radiator and at soldering temperature liquid material with good thermal conductivity, in particular a eutectic zinc-aluminum alloy. is arranged and that the surface of the soldering iron is roughened and / or blackened. This combination ensures that the 'temperature variations at the soldering tip during and between the soldering operations is kept to a minimum. A fast operational readiness is arranged by a in the heating circuit and with a diode bridged by a time relay has reached

Another feature of soldering iron with tubular body and handle is that only the front, remote from the handle portion of the tube is provided with a roughened and blackened surface, the heater consists of a Mantelheizdrahtwicklung in a demarcated between two slices and with the at soldering temperature liquid substance is arranged completely filled space, with the soldering tip with; the side introduced into the soldering iron rests against the entire surface of the front disk and is secured in the pipe by means of corrugations »

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According to the invention, according to another embodiment, additional cooling surfaces are arranged on the soldering iron instead of the roughened surface. "

embodiment

The invention is illustrated and explained in greater detail with reference to the drawing. A tube 1 which is partially sandblasted and burnished is held in a soldering iron handle 2 in the untreated side. In the tube 1 there is a jacket heating wire winding 3 which is held on the handle side by a disk 4 · Before the heating coil 3, a further disc 5 is arranged on the free tube side · The space formed by the discs 4 and 5 in the tube 1 is completely filled with a eutectic zinc-aluminum alloy 6 which surrounds the heating coil on all sides · On the disc 5 is a soldering tip 7 used in the free end of the tube and firmly pressed by means of beads 8 in the pipe. If the soldering tip 7 is formed of a durable material as a so-called Daüerlötspitse and instead of the beads 8 a continuous annular bead is attached, can be dispensed with the disc 5. The soldering tip 7 is then in direct contact with the zinc-aluminum alloy 6. A diode 9 is arranged in the heating circuit of the soldering iron and a time relay 10 is connected in parallel thereto.

When starting the soldering iron, the diode 9 is bridged by time relay 10 and is turned on according to the predetermined heat-up time shortly before reaching the idle temperature of the soldering iron automatically by opening the timing relay 10. The zinc-aluminum alloy 6 is thus quickly converted into the liquid state, the soldering iron is ready in no time. By the design of the outer surface of the tube 1, a large amount of heat is radiated in the operating state of the soldering iron, and thus a relatively low emptying.

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running temperature guaranteed. On the other hand, a high heat flow to the solder joint is generated by least heat transfer resistance between Mantelheizdrahtwicklung 3 as the heat source and soldering tip 7 as a heat dissipation point. Just by the ratio of high heat emission at the pipe 1 against a likewise high thermal conductivity to the soldering tip 7 in conjunction with the heat storage by zinc-aluminum alloy 6 is at the soldering tip? a temperature which only fluctuates in minimal limits, whereby all measures of a control are without object and nevertheless good soldering results are achieved by optimum soldering temperature.

The same result can be achieved by changing the geometry of the outer surface of the soldering iron in a manner not shown, z, B, by a triangular or star-shaped cross section. An enhancement of the effect can also be achieved by arranging additional cooling surfaces on the outer surface ,

Claims (5)

invention claim 1 ·· 'Electric soldering iron with a radiator and a soldering tip, which has a low idling temperature, in particular for precision soldering in the electronics, characterized in that between the radiator (3) and Lotspitze. (7) a radiator (3). enclosing and at soldering temperature liquid substance (6) is arranged with good thermal conduction properties and that the surface of the soldering iron is roughened and / or blackened 2. Soldering iron according to item 1, characterized in that the liquid at soldering temperature (6) is a eutectic zinc-aluminum alloy · Soldering iron according to item 1 or 2, having a hollow cylindrical body held in a handle, characterized in that only the front part of the pipe (1) which is sent to the handle (2) is provided with a roughened and blackened surface heating element consisting of a jacket wire winding (3) arranged in a space delimited and completely filled with the soldering liquid (6), the soldering tip (7) with the inserted into the soldering iron side over the entire surface of the front disc (5) and is secured by means of corrugations (· 8) in the tube (1). 4 # soldering iron according to one of the items 1 to 3, characterized in that a diode (9) 'bridged by a time relay (10) is arranged in the heating circuit. 5. Lotkol'öen-one of the items 1 -to-4, characterized in that instead of the roughened surface des.Rohres: (1). or in addition to these cooling surfaces are arranged on the surface. tea 1 SdI * Zf & £ b £ j